One of the easiest ways to cut fuel costs is to drive more efficiently. Many cars now have onboard trip computers that show fuel consumption but few advise you how to reduce it.rnOne new product that tries to fill this gap is Vexia's Econav sat nav. Ths combines speed and acceleration information with technical information from its car model database to let you know the best time to change gear and the most efficient speed for the gearrnyou're in. Even automatic cars can benefit, as it also warns you about excessive acceleration or braking.
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